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leaf

A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot. Leaves are collectively referred to as foliage, as in "autumn foliage". Although leaves can be seen in many different shapes, sizes and textures, typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized for photosynthesis. In most leaves, the primary photosynthetic tissue, the palisade mesophyll, is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of Eucalyptus, palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves have distinctive upper surface (adaxial) and lower surface (abaxial) that differ in colour, hairiness, the number of stomata (pores that intake and output gases), epicuticular wax amount and structure and other features. Broad, flat leaves with complex venation are known as megaphylls and the species that bear them, the majority, as broad-leaved or megaphyllous plants. In others, such as the clubmosses, with different evolutionary origins, the leaves are simple, with only a single vein and are known as microphylls. Some leaves, such as bulb scales are not above ground, and in many aquatic species the leaves are submerged in water. Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls and spines.
Muchomorek - colorful jigsaw puzzle
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Muchomorek

Added 2 days ago by andi

18

painting - autumn landscape, park, bench
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painting

Added 2 days ago by Agul

16

New York Central Park - New York Central Park among skyscrapers
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New York Central Park

Added 3 days ago by Agul

246

autumn landscape - autumn landscape, with a bridge
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autumn landscape

Added 4 days ago by Agul

280 2

Colors of autumn. - Fiery colors of colorful autumn.
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Colors of autumn.

Added 5 days ago by Grażyna

49

Oliwa Park. - Oliwa Park in Gdansk.
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Oliwa Park.

Added 5 days ago by Zeta

73

Redwoods. - Sequoias in Redwood National Park, California.
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Redwoods.

Added 5 days ago by Zeta

25 1

Pond in the park. - Pond in an autumn park.
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Pond in the park.

Added 5 days ago by Zeta

20

Autumn in the park. - Beautiful autumn in the park.
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Autumn in the park.

Added 5 days ago by Zeta

38

White bench. - Autumnal forest with a white bench.
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White bench.

Added 5 days ago by Zeta

26

Lake in Oregon. - Lake Lost Lake with views of the Mount Hood stratovolcano.
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Lake in Oregon.

Added 5 days ago by Zeta

42

Autumn in Oregon. - Autumn in Oregon. USA.
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Autumn in Oregon.

Added 6 days ago by Zeta

46

Bieszczady. - Autumn in the Bieszczady.
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Bieszczady.

Added 6 days ago by Zeta

55

Mansion by the water. - I do not know where it is, but it captivates with its beauty.
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Mansion by the water.

Added 6 days ago by Zeta

47

Colorful autumn. - Shades of autumn. Very beautiful.
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Colorful autumn.

Added 6 days ago by Zeta

33

Fabulous waterfall - Fabulous views, a waterfall, water, rocks.
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Fabulous waterfall

Added week ago by Jerzyna

199 1

Autumn leaf - Autumnal yellow maple leaf, full autumn
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Autumn leaf

Added week ago by jaija

35

nature itself - nature itself ---- leaves, leaves
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nature itself

Added 9 days ago by Basiunia

90

fashion and beauty - fashion and beauty --- autumn leaves
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fashion and beauty

Added 9 days ago by Basiunia

55

Ciechocinek. - Ciechocinek carpets of flowers.
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Ciechocinek.

Added 9 days ago by Grażyna

547 1

Colorful autumn - Colorful and colorful autumn
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Colorful autumn

Added 10 days ago by Hhh

67

Beautiful garden. - An amazingly beautiful garden.
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Beautiful garden.

Added 10 days ago by Grażyna

432

Near the pond. - By the pond in the forest .....
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Near the pond.

Added 10 days ago by Grażyna

136

Park alley. - Park alley in Kudowa Zdrój.
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Park alley.

Added 11 days ago by Grażyna

94 1

brook in leaves - brook in leaves, autumn
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brook in leaves

Added 11 days ago by Agul

377 1

A hut in the woods. - A hut in an autumn forest.
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A hut in the woods.

Added 12 days ago by Grażyna

185

Cottage on the river. - A charming house by the river.
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Cottage on the river.

Added 13 days ago by Grażyna

352

road through the forest - road through the autumn forest
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road through the forest

Added 13 days ago by Agul

259 1

from Lower Silesia - from Lower Silesia, Szklarska Poręba
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from Lower Silesia

Added 13 days ago by Agul

319 2

Hanging inflorescences - Hanging inflorescences - autumn is approaching.
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Hanging inflorescences

Added 2 weeks ago by Mila

90

Colorful autumn. - Colorful autumn in painting.
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Colorful autumn.

Added 2 weeks ago by Grażyna

71

Charming autumn. - Unique colors of autumn.
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Charming autumn.

Added 2 weeks ago by Grażyna

383 3

autumn colors - landscape in autumn colors
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autumn colors

Added 2 weeks ago by Agul

276

Birds sat on the twig - Birds sat on the twig
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Birds sat on the twig

Added 2 weeks ago by Agul

115 1

autumn landscape - autumn landscape with birches
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autumn landscape

Added 2 weeks ago by Agul

297 1

Very autumn. - Beautiful and sunny autumn.
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Very autumn.

Added 2 weeks ago by Grażyna

148 1

It used to be spring. - A memory of spring.
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It used to be spring.

Added 2 weeks ago by Grażyna

97 1